![]() ![]() ![]() Vibrating probe-type sensors are often used to detect solid materials such as powders, bulk solids, grain, flour, plastic granules, cement, and fly ash. They do not require recalibration between batches and can be cleaned in place. These switches are good candidates for use in multiple purpose processing equipment where they must be compatible with a variety of process materials and process conditions. Although some can detect other process properties besides level, their main purpose is to measure the presence or absence of material at a particular level in a tank. ![]() In some specialized applications, all three of these switches have been tuned to identify specific materials or to determine when a material reaches a particular viscosity, density, opacity, or thermal conductivity condition.Īll three level switch designs are simple, straightforward, and reliable. The optical level switch is also suited for detecting high foam levels, if it is spray washed after each event. Typically, they are used in applications that either cannot be handled by the more common float and probe-type devices, or when ultrasonic, nuclear, radar or microwave designs would be too sophisticated, expensive, or otherwise unsuited for the task.Īll three types can be used to detect liquid levels or interfaces between liquids. Thermal, vibrating, and optical level switches are specialty devices developed to solve specific level detection problems. ![]()
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